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How to Spot a Liar
However much we may abhor it, deception comes naturally to all living things.
Birds do it by
feigning injury to lead hungry predators away from nesting
young. Spider crabs do it by disguise: adorning
themselves with strips of kelp
and
other debris, they pretend to be something they are not – and so escape
their enemies. Nature amply rewards successful deceivers by allowing them to survive long enough to mate
and reproduce. So it may come as no surprise to learn that human beings- who, according to psychologist
Gerald Johnson of the University of South California, or lied to about 200 times a day, roughly one untruth
every 5 minutes- often deceive for exactly the same reasons: to save their own skins or to get something they
can’t get by other means.
But knowing how to catch deceit can be just as important a survival skill as knowing how to tell a lie
and get away with it. A person able to spot falsehood quickly is unlikely to be swindled by an unscrupulous
business associate or hoodwinked by a devious spouse. Luckily, nature provides more
than enough clues to
trap dissemblers in their own tangled webs- if you know where to look. By closely observing facial
expressions, body language and tone of voice, practically anyone can recognise the tell-tale signs of lying.
Researchers are even programming computers – like those used on Lie Detector to get at the truth by
analysing the same physical cues available to the naked eye and ear.
“With the proper training, many people can learn to reliably detect lies,” says Paul Ekman, professor
of psychology at the University of California, San Francisco, who has spent the past 15 years studying the
secret art of deception.
In order to know what kind of Lies work best, successful liars need to accurately assess other people’s
emotional states. Ackman’s research shows that this same emotional intelligence is essential for good lie
detectors, too. The emotional state to watch out for is stress, the conflict most liars
feel between the truth and
what they actually say and do.
Even high-tech lie detectors don’t detect lies as such; they merely detect the physical cues of
emotions, which may or may not correspond to what the person being tested is saying. Polygraphs, for
instance, measure respiration, heart rate and skin conductivity, which tend to increase when people are
nervous – as they usually are when lying. Nervous people typically perspire, and the salts contained in
perspiration conducts electricity. That’s why sudden leap in skin conductivity indicates nervousness -about
getting caught, perhaps which makes, in turn, suggest that someone is being economical with the truth. On
the other hand, it might also mean that the lights in the television Studio are
too hot which is one reason
polygraph tests are inadmissible in court. “Good lie detectors don’t rely on a single thing” says Ekma ,but
interpret clusters of verbal and non-verbal clues that suggest someone might
be lying.”
The clues are written all over the face. Because the musculature of the face is directly connected to
the areas of the brain that processes emotion, the countenance can be a window to the soul. Neurological
studies even suggest that genuine emotions travel different pathways through the brain than insincere ones.
If a patient paralyzed by stroke on one side of the face, for example, is asked to smile deliberately, only the
mobile side of the mouth is raised. But tell that same person a funny joke, and the patient breaks
into a full
and spontaneous smile. Very few people -most notably, actors and politicians are able to consciously control
all of their facial expressions. Lies can often be caught when the liars true feelings briefly leak through the
mask of deception.
We don’t think before we feel, Ekman says. “Expressions tend to show up on the face before we’re
even conscious of experiencing an emotion.” One of the most difficult facial expressions to fake- or conceal,
if it’s genuinely felt is sadness. When someone is truly sad, the forehead wrinkles with grief and the inner